It does not take a PhD, or any study at any school to be able to see that the more vaccinated people the less outbreak of preventable disease such as Measles.
(From top to bottom: Figure 1 2012, Figure 2 2000, Figure 3 1990, Figure 4 1980)
Left column is Measles cases (dark colors indicate higher numbers) and Right column is vaccinations (dark colors indicate higher numbers). Grey colors indicate no data available.
Please share, as a picture does really say more than a thousand words.
This is even more important when governments are considering letting parents get out of vaccinating children due to religious or moral objections. Th only way to get out of a vaccine should be medical safety. Your god and your moral conscience are not something viruses care about. Your moral conscience and your god will not save you, you will/may get sick and you may die.